Shelter



FIG. 1 is a perspective view of an ornamental design for a shelter according to a first embodiment;

FIG. 2 is a first side view thereof;

FIG. 3 is a front view thereof;

FIG. 4 is a second side view thereof; the top thereof is essentially planar;

FIG. 5 is a perspective view of an ornamental design for a shelter according to a second embodiment;

FIG. 6 is a first side view thereof;

FIG. 7 is a front view thereof; and,

FIG. 8 is a second side view thereof; and, the top thereof is essentially planar; wherein the underside of each of the side members is substantially planar. 

The ornamental design for a shelter, as shown and described. 